When it comes to women, men prefer a good brain over all else.
According to Professor David Bainbridge, an evolutionary biologist at the University of Cambridge, men prefer women with intelligence because there's a higher likelihood the woman will be a more responsible mother.
He also claimed men liked breasts whatever size providing they are symmetrical, and the length of legs is irrelevant providing they are straight.
"Breast size doesn't matter," he told an audience at the Hay Festival.
"Actually large breasts are more likely to be asymmetric and men are more attracted to symmetry. And they look older more quickly, and men value youth.
"And men are not looking for long legs. Straight legs are a sign of genetic health so that is something that is more attractive, but surveys have shown most men prefer regular length.
"The main thing that men are looking for is intelligence.
"Surveys have shown time and time again that this is the first thing that men look for. It shows that she will be able to look after his children and that her parents were probably intelligent as well, suggesting that she was brought up well."